More water

Toots Thielemans is the most celebrated jazz musician in Belgium. Most Americans haven't heard of him, but they've heard his music (Most famously, in the show Moonlighting.) Whenever other famous musicians come to Belgium, he always plays a set with them. Once, he was preparing to play with pianist Kenny Werner. And Toots said to Kenny...

Kenny, throw me into the deep end of the pool. Just don't let me drown.

Meaning, play what you want, but help me play my best along with you.